I’d like to add a question here
I am using the adrenaline pump, which does away with internal check valves. This supposedly allows full volume of flow to both sides and I remember reading at the time that this “feature” means a crossover line is not needed.
My thoughts are that another link in this circuit would still provide an advantage in keeping a balance between the heads. However, being that there isn’t really a return line all the pump is doing is providing pressure.
Do you have an opinion on this?